+VS
參數(shù)資料
型號(hào)： AD8229HRZ-R7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 9/24頁(yè)
文件大?。?/td> 0K
描述： IC AMP INST LN 8SOIC
標(biāo)準(zhǔn)包裝： 1,000
放大器類型： 儀表
電路數(shù)： 1
轉(zhuǎn)換速率： 22 V/µs
-3db帶寬： 15MHz
電流 - 輸入偏壓： 70nA
電壓 - 輸入偏移： 100µV
電流 - 電源： 6.7mA
電流 - 輸出 / 通道： 35mA
電壓 - 電源，單路/雙路(±)： ±4 V ~ 17 V
工作溫度： -40°C ~ 175°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SO
包裝： 帶卷 (TR)
Data Sheet
AD8229
Rev. B | Page 17 of 24
THEORY OF OPERATION
A3
A1
A2
Q2
Q1
C1
C2
+IN
–IN
+VS
–VS
+VS
–VS
+VS
–VS
R3
5k
R4
5k
R5
5k
RG–
+VS
–VS
OUTPUT
REF
NODE 1
NODE 2
IB
COMPENSATION
IB
COMPENSATION
RG
VB
I
+VS
–VS
+VS
–VS
R6
5k
RG+
R2
3k
R1
3k
09412
-05
8
Figure 56. Simplified Schematic
ARCHITECTURE
The AD8229 is based on the classic 3-op-amp topology. This
topology has two stages: a preamplifier to provide differential
amplification followed by a difference amplifier that removes the
common-mode voltage and provides additional amplification.
Figure 56 shows a simplified schematic of the AD8229.
The first stage works as follows. To keep its two inputs matched,
Amplifier A1 must keep the collector of Q1 at a constant voltage. It
does this by forcing RG to be a precise diode drop from –IN.
Similarly, A2 forces RG+ to be a constant diode drop from +IN.
Therefore, a replica of the differential input voltage is placed
across the gain setting resistor, RG. The current that flows
through this resistance must also flow through the R1 and R2
resistors, creating a gained differential signal between the A2
and A1 outputs.
The second stage is a G = 1 difference amplifier, composed of
Amplifier A3 and the R3 through R6 resistors. This stage removes
the common-mode signal from the amplified differential signal.
The transfer function of the AD8229 is
VOUT = G × (VIN+ VIN) + VREF
where:
G
R
G
kΩ
6
1 +
=
GAIN SELECTION
Placing a resistor across the RG terminals sets the gain of the
AD8229, which can be calculated by referring to Table 5 or by
using the following gain equation:
1
kΩ
6
=
G
RG
Table 5. Gains Achieved Using 1% Resistors
1% Standard Table Value of RG ()
Calculated Gain
6.04 k
1.993
1.5 k
5.000
665
10.02
316
19.99
121
50.59
60.4
100.34
30.1
200.34
12.1
496.9
6.04
994.4
3.01
1994.355
The AD8229 defaults to G = 1 when no gain resistor is used.
The tolerance and gain drift of the RG resistor should be added
to the AD8229’s specifications to determine the total gain accuracy
of the system. When the gain resistor is not used, gain error and
gain drift are minimal.
RG Power Dissipation
The AD8229 duplicates the differential voltage across its inputs
onto the RG resistor. The RG resistor size should be chosen to
handle the expected power dissipation.
REFERENCE TERMINAL
The output voltage of the AD8229 is developed with respect to
the potential on the reference terminal. This is useful when the
output signal must be offset to a precise midsupply level. For
example, a voltage source can be tied to the REF pin to level-
shift the output so that the AD8229 can drive a single-supply
ADC. The REF pin is protected with ESD diodes and should
not exceed either +VS or VS by more than 0.3 V.
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